Option variable
%emodeDefault value: true
When %emode is true,
%e^(%pi %i x) is simplified as
follows.
%e^(%pi %i x) simplifies to cos (%pi x) + %i sin (%pi x) if x is an integer or
a multiple of 1/2, 1/3, 1/4, or 1/6, and then further simplified.
For other numerical x,
%e^(%pi %i x) simplifies to %e^(%pi %i y) where y is x - 2 k
for some integer k such that abs(y) < 1.
When %emode is false, no
special simplification of %e^(%pi %i x) is carried out.